Molecular design of a non-fullerene acceptor enables a P3HT-based organic solar cell with 9.46% efficiency,Energy & Environmental Science

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Molecular design of a non-fullerene acceptor enables a P3HT-based organic solar cell with 9.46% efficiency
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-07-21 , DOI: 10.1039/d0ee01763a
Chenyi Yang _{1,

2,

3,

4,

5} , Shaoqing Zhang _{1,

2,

3,

4,

5} , Junzhen Ren _{4,

5,

6,

7,

8} , Mengyuan Gao _{4,

9,

10,

11} , Pengqing Bi _{4,

5,

6,

7,

8} , Long Ye _{4,

9,

10,

11} , Jianhui Hou _{1,

2,

3,

4,

5}

Affiliation

The advantage of low cost makes P3HT one of the most attractive electron donors for photovoltaic applications, but the power conversion efficiency (PCE) of the P3HT-based organic solar cells (OSCs) remains low (7–8%). Herein, to modulate the phase separation morphology so as to enhance the PCE in P3HT-based OSCs, a new NFA, namely ZY-4Cl, is designed and synthesized by modifying the cyano-substituted end groups in BTP-4Cl. The P3HT:ZY-4Cl based OSC exhibits a significantly improved PCE of ∼9.5%, which is a new record for the P3HT-based OSCs. Furthermore, two model compounds, TT-CN and TT-O, are synthesized to simulate the end groups of BTP-4Cl and ZY-4Cl, respectively. The calculated Flory-Huggins interaction parameter, the DSC and the AFM results clearly indicate that the cyano-substituted compound TT-CN shows much stronger miscibility with P3HT compared to TT-O, the one without cyano groups. This molecular design strategy is also verified in the other two representative NFAs. Therefore, this work not only reports an NFA with a high PCE for P3HT-based OSCs, but also suggests guidance for the molecular design of NFAs from the aspect of morphology control.

中文翻译：

非富勒烯受体的分子设计使基于P3HT的有机太阳能电池的效率达到9.46％

低成本的优势使P3HT成为光伏应用中最有吸引力的电子供体之一，但是基于P3HT的有机太阳能电池（OSC）的功率转换效率（PCE ）仍然很低（7-8％）。在此，为了调节相分离形态以增强基于P3HT的OSC中的PCE，通过修饰BTP-4Cl中的氰基取代的端基，设计并合成了一种新的NFA，即ZY -4Cl。基于P3HT：ZY-4Cl的OSC的PCE显着提高了9.5％，这是基于P3HT的OSC的新记录。此外，两种模型化合物TT-CN和TT-O分别模拟BTP-4Cl和ZY-4Cl的端基。计算出的Flory-Huggins相互作用参数，DSC和AFM结果清楚地表明，与没有氰基的TT-O相比，氰基取代的化合物TT-CN与P3HT的相溶性强得多。其他两个代表性NFA也验证了这种分子设计策略。因此，这项工作不仅报告了基于P3HT的OSC具有较高PCE的NFA ，而且还从形态控制的角度为NFA的分子设计提供了指导。

更新日期：2020-09-16

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